[Gavino]

Previously, I said:

Originally Posted by Gavino

Because of restrictions on Crop() positions for different video types, it may be preferable instead to use the cropping facility of a resizer, which supports subpixel cropping positions.

It will also give a smoother continuous pan than jumping by discrete pixels via Crop().

Thanks to StainlessS, I have noticed a few errors in my script above. It should be:

LoadPlugin("C:\...DGDecode.dll")
mpeg2source("F:\....d2v")
orig = last
ScriptClip(PointResize(1280,720), """
    x = current_frame   #variable
    a = 0.0000000029017      #constants
    b = 0.00241882
    c = -2.47594795
    
    pdown = a*x*x+b*x+c    #number of pixels to crop from the top of the 1080 frame
    # no need to round, and can be negative
       
    orig.Spline36Resize(1280, 720, 320, pdown, -320, 720)
""")